Odd text output at prompt using fish-shell

Question

The Problem

I have an odd problem with Fish Shell on my Ubuntu 13.10 laptop. I've been using Fish for a few months now with 100% default settings. Last night everything seemed fine, but this morning I noticed something when I opened a new terminal. Every time I hit a key on the keyboard, the text write to 5 is output to the console. See the screenshot below for an example of what happened when I typed ls and pwd commands at the prompt.

My Questions

How do I go about finding the source of this odd text? Is it a fish config file? A fish function that got redefined by mistake?

More Clues

• I first noticed this behavior after opening a new fish shell this morning.
• Another shell I had left open from last night did not have the problem.
• All new fish shells have the problem.
• I do not see the problem if I start a bash shell inside an existing fish shell.
• Rebooting my laptop did not help.
• I am overwhelmed by the fish documentation.

Screenshot

Answer 1

I think you are using nightly builds? This was a debugging line that made it into a nightly, and should have been fixed the following day.

The bug tracking this is https://github.com/fish-shell/fish-shell/issues/1413